/Engine/Source/Runtime/Foliage/Public/ProceduralFoliageSpawner.h
const [TArray](API\Runtime\Core\Containers\TArray)< [TSoftObjectPtr](API\Runtime\CoreUObject\UObject\TSoftObjectPtr)< [UMaterialInterface](API\Runtime\Engine\Materials\UMaterialInterface) > > & GetFoliageTerrainMaterials() const